Fix nullref exception in expander refactoring #10168
Merged
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Fixes - insertion issue
Context
Dereferencing null can happen
https://devdiv.visualstudio.com/DevDiv/_build/results?buildId=9615450&view=logs&j=018464ba-1ca1-5561-2761-cd93078ac78a&t=3574efd9-071a-5092-469d-6ae99dc3b0cf&l=71278